// Copyright 2022 Linkall Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package errors

import (
	"errors"
	"testing"

	. "github.com/smartystreets/goconvey/convey"
)

func TestChain(t *testing.T) {
	Convey("test chain method", t, func() {
		err := Chain()
		So(err, ShouldBeNil)

		err = Chain(nil)
		So(err, ShouldBeNil)

		err = Chain(nil, errors.New("err1"))
		So(err, ShouldResemble, Chain(nil, errors.New("err1")))

		err = Chain(err, errors.New("err2"))
		So(errors.Unwrap(err).Error(), ShouldResemble, "err2: err1")

		err = Chain(err, errors.New("err3"), nil, errors.New("err4"))
		So(errors.Unwrap(err).Error(), ShouldResemble, "err4: err3: err2: err1")
	})
}
